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logically thinking, they know it. at least, some of them know. garp knows it for sure, because he trained both ace and rufy when they were child. and garp addressed dragon as rufy's father. because there were lot of marines with garp when he stated it, and they became astonished by hearing it, it appears they came to know ace-dragon relationship. but, thinking beyond it, it seems that monkey family's relationship are supposed to be secret. garp said so, just after spouting it to all the bystander. so, i guess the high grades, like sengoku, maybe the three admirals, the ten vice-admirals, and the five elder stars, or whatever their name is, know. a proof could be exactly that garp subordinates didn't knew it. rufy himself didn't knew it.
and so ivankov, who is, or was, really close to dragon. it seems that dragon and his enemies don't want this new to spread around the world.